Some people wear masks only in crowds,______ they expect to come into contact with lots of germs.A.which B.when C.where D.as

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Some people wear masks only in crowds,______ they expect to come into contact with lots of germs.
A.which B.when C.where D.as

C
= in which 指在人群中
引导定语从句

C. where

C. where

B.which引导定语从句,指前面所讲的crowds.